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In the present work we introduce a technique to form a photocatalyst, basedon Pt nanoparticles suspended over the mouth of TiO2 nanotubes. Thesestructures are obtained by the decoration of the top end of highly ordered TiO2nanotubes with a web of TiO2 nanofibrils, followed by sputter deposition of aminimum amount of Pt. A subsequent thermal dewetting step forms 3-6 nm-sized Ptnanoparticles along the nanofibrils. These structures, when compared toconventional Pt decoration techniques of TiO2 nanotubes, show a stronglyenhanced photocatalytic H2 evolution efficiency.

Suspended Pt nanoparticles over TiO2 nanotubes for enhanced photocatalytic H2 evolution